Top surface of a bottle cap



FIG. 1 is a plan view of a top surface of a bottle cap showing the new design.

FIG. 2 is a plan view of a top surface of a bottle cap showing the new design; and,

FIG. 3 is a plan view of a top surface of a bottle cap showing the new design.

The broken line showing in the figures is included for the purpose of illustrating environment and forms no part of the claimed design. 

CLAIM The ornamental design for a top surface of a bottle cap, as shown and described. 